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1913年，（  ）创造了革命性的汽车生产线技术。
A、通用公司
B、丰田公司
C、福特公司
D、大众公司

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Magic（魔法）often forces us not to believe our own eyes or even appears to be breaking laws of physics or nature! The word "magic" has many different meanings. When a bird appears in a hat or when someone declares that he could see into the future－both can be called magic. When a sick person suddenly becomes well or a well person (or even animal) becomes ill, magic is the cause. The British author Terry Pratchett uses magic a great deal in his popular Discworld series of books.
Magic has always been used for fun. People enjoy working out in which cup the little ball is or how he knows which card I was thinking of. Harry Houdini was one of the first world-famous magicians－famous for escaping from deadly situations. Recently David Copperfield, or David Blane, has become very popular for his "unbelievable abilities", such as making the Statue of Liberty disappear or rise.
Magical rings and three-headed dogs may not be real, but does this mean nothing magical really exists? Can you always explain how the magician has done the card trick? Maybe it is better not to explain, but to leave a little magic in our lives. Pick a card, any card…
The author explains what magic is in paragraph 1 by ____.（　　）
A.givingcausesandeffects
B.usingexamples
C.comparingahealthypersonwithasickone
D.listingthetimeofmagicalevents
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下列反应错误的是
A、
B、
C、
D、
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按《中小学校设计规范》规定，下列关于教学楼楼梯的表述中哪条符合规范要求？( )
A.楼梯可采用扇形踏步，但应符合防火规范的要求
B.楼梯的坡度不应大于30°
C.楼梯梯段的净宽度大于2500mm时应设中间扶手
D.楼梯井的宽度不应大于110mm，当超过110mm时必须采取安全防护措施
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